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Revolving Credit Facility and Bank Borrowings (Revolving Credit Facilities and Notes Payable) (Details)
12 Months Ended
Dec. 31, 2017
USD ($)
Feb. 28, 2018
USD ($)
Feb. 26, 2018
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
USD ($)
Dec. 26, 2013
USD ($)
Line of Credit Facility [Line Items]            
Amount allowed for repurchase under Amendment $ 68,800,000         $ 350,000,000
Senior Revolving Credit Facility [Member]            
Line of Credit Facility [Line Items]            
Outstanding letters of credit 600,000          
Revolving Credit Facility [Member] | Senior Revolving Credit Facility [Member]            
Line of Credit Facility [Line Items]            
Amount allowed for repurchase under Amendment 350,000,000          
Authorized annual share repurchases 50,000,000          
Maximum capital expenditures and commitments 50,000,000          
Intercompany loans permitted 375,000,000          
Borrowings outstanding threshold for financial covenant ratios $ 40,000,000          
Percentage of commitments in average outstanding borrowings (percent) 40.00%     40.00%    
Minimum fixed charge coverage ratio 110.00%     110.00%    
Leverage ratio 200.00%     200.00%    
Current borrowing capacity $ 100,000,000          
Outstanding borrowings on the Facility 0          
Available borrowing capacity 99,400,000       $ 78,700,000  
Revolving Credit Facility [Member] | Asia Pacific Revolving Credit Facility [Member]            
Line of Credit Facility [Line Items]            
Current borrowing capacity 9,200,000     ¥ 60,000,000    
Revolving Credit Facility [Member] | China Merchant Bank Company Facility (CMBC Facility) [Member]            
Line of Credit Facility [Line Items]            
Current borrowing capacity 4,600,000     30,000,000    
Revolving Loan Facility [Member] | Asia Pacific Revolving Credit Facility [Member]            
Line of Credit Facility [Line Items]            
Current borrowing capacity $ 6,100,000     ¥ 40,000,000    
Base Rate [Member] | Revolving Credit Facility [Member] | Senior Revolving Credit Facility [Member] | Minimum [Member]            
Line of Credit Facility [Line Items]            
Margin on variable rate (percent) 0.50%          
Base Rate [Member] | Revolving Credit Facility [Member] | Senior Revolving Credit Facility [Member] | Maximum [Member]            
Line of Credit Facility [Line Items]            
Margin on variable rate (percent) 0.75%          
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Senior Revolving Credit Facility [Member] | Minimum [Member]            
Line of Credit Facility [Line Items]            
Margin on variable rate (percent) 1.50%          
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Senior Revolving Credit Facility [Member] | Maximum [Member]            
Line of Credit Facility [Line Items]            
Margin on variable rate (percent) 1.75%          
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Asia Pacific Revolving Credit Facility [Member]            
Line of Credit Facility [Line Items]            
Margin on variable rate (percent) 2.10%          
People's Bank of China Lending Rate [Member] | Revolving Credit Facility [Member] | Asia Pacific Revolving Credit Facility [Member]            
Line of Credit Facility [Line Items]            
Margin on variable rate (percent) 10.00%          
Subsequent Event [Member]            
Line of Credit Facility [Line Items]            
Amount allowed for repurchase under Amendment     $ 500,000,000.0      
Subsequent Event [Member] | Revolving Credit Facility [Member] | Senior Revolving Credit Facility [Member]            
Line of Credit Facility [Line Items]            
Amount allowed for repurchase under Amendment   $ 600,000,000        
Authorized annual share repurchases   $ 100,000,000